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GENODE SculptOS
(lemmy.sdf.org)
This is not a Unix like OS, but it does have a shell which can somewhat emulate a UNIX environment.
SculptOS is a microkernel OS capable of strict sandboxing and virtualisation. It could almost be compared to QubesOS in some ways, while it's package management might be compared to NixOS. Although, neither are anything like SculptOS.